AD 90-26-06

Final rule

90-26-06 SAAB-SCANIA: Amendment 39-6833. Docket No. 90-NM-161-AD.
Applicability: Model SF-340A series airplanes, Serial Numbers 004 through 138, inclusive, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent reduced structural integrity of the horizontal stabilizer, accomplish the following:

A. Prior to the accumulation of 16,000 landings or within 90 days after July 13, 1990 (the effective date of AD 90-12-12, Amendment 39-6628), whichever occurs later, accomplish the following:

1. Perform an eddy current inspection to detect cracks in the horizontal stabilizer, in accordance with SAAB-Scania Service Bulletin 340-55- 013, dated December 1, 1989. If cracks are detected, repair prior to further flight, in accordance with the service bulletin.

2. Reinforce the horizontal stabilizer, in accordance with SAAB-Scania Service Bulletin 340-55-013, dated December 1, 1989.

B. Prior to the accumulation of 16,000 landings, or within 90 days after the effective date of this AD, whichever occurs later, accomplish the following in accordance with the Accomplishment Instructions in SAAB-Scania Service Bulletin 340-55-027, dated June 28, 1990, or Revision 1, October 10, 1990.

1. Remove the left and right drag angles and associated shims.

2. Perform a visual and dye penetrant inspections of the drag angle attaching holes; if cracks are found, repair prior to further flight.

3. Install new drag angles and associated shims.

C. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM- 113, FAA, Transport Airplane Directorate.

NOTE: The request should be submitted directly to the Manager, Standardization Branch, ANM- 113, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrenceto the Manager, Standardization Branch, ANM-113.

D. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to SAAB-Scania AB, Produce Support, S-581.88, Linkoping, Sweden. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington.

Airworthiness Directive 90-26-06 supersedes AD 90-12-12, Amendment 39- 6628.

This amendment (39-6833, AD 90-26-06) becomes effective on January 16, 1991.